AS-Interface reversing starter with integrated brake control
The 3RK4320-3NQ51-1BA3: That AC-3 rating means it switches squirrel-cage motors up to that current — the typical load for reversing starters on conveyors, hoists, and gate drives where direction change is part of the cycle. It carries a Class 10 trip characteristic via a bimetal overload relay, so it clears a stalled-rotor condition within 10 seconds at 600% of the set current — standard protection for standard induction motors. The 3-pole main circuit handles the motor leads; the integrated motor brake output (400 V AC) means you don't need a separate brake contactor for motors with AC brakes.
The operating voltage range is 340 to 440 V AC at 50 or 60 Hz — it covers 400 V nominal supplies with tolerance, but won't run on 480 V systems without a step-down transformer. The control supply is 20.4 to 26.4 V DC, so it needs a 24 V DC bus from the AS-Interface power supply or a separate PELV source. Two digital inputs are onboard for local start/stop or direction commands, supplementing the AS-Interface control word. The ambient operating range is -25 to +50 °C — fine for most indoor panels but tight for a hot motor control centre above 50 °C; derating applies above that ceiling. Mounting is flexible: the unit can be rotated ±180° on a vertical surface and tilted ±22.5° forward or backward. That helps when you're fitting it into a tight enclosure corner or aligning the AS-Interface cable entry. IP54 means it's protected against dust ingress and splashing water — suitable for dry factory-floor cabinets but not washdown zones.
Sourcing and lifecycle — current production, quoted to order
The footprint is 205 mm deep by 245 mm wide by 215 mm high — verify the panel cut-out and clearance for the AS-Interface bus connector before committing. No direct second-source or cross-reference to the listed alternate MPNs (6ES7517-3FP00-0AB0, 6AG1215-1BG40-5XB0, 6ES7214-1BG40-0XB0) exists; those are Siemens PLC CPUs, not motor starters, so a panel designed around them won't accept this unit without a full rewire and bus reconfiguration.